I have the W3C Recommendation 24 December 1999 for HTML 4.01.
The IFRAME element is indeed defined in the transitional DTD. I must
have misted it.
Iframes are very useful when someone is writing a web application that is
using multiple data sources for the contents of one screen and when the site
is very dynamic (i.e. you click on an account number -> you get the info
right away, instead of waiting for the entire page to refresh - the page may
contain information about the user, the list of accounts, etc.).
About XHTML ... I have seen the specification for 1.0. Very disappointing.
I think that XML and XML based standards are too many and too many people
uses XML just because it is so praised.
Back to DTD, I wanted to use the document type declaration to ensure that
the
browsers display the content of the site correctly. I saw a release note for
Netscape 7.01 that said that the browser displays differently the pages with
the
DTD specified than the ones without it.
Best regards.
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